Call volume is very low!!

Call volume is very low!!

Hello:

I got two new iphone 4s last night, and I'm having issues with the call volume it's very low, even when the call volume is all the way up, I tried many things ranging from turning the phone off and soft reset, and setting reset, and still the volume is very low, I can barely hear...

is this a common problem with iphone 4s because both my iphone 4s have the same issue...

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